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Contrary to common usage, gravity is not a force. It is a change in the dynamics of space, so in a gravitational field you are moving but feel like you are standing still. Actually you ARE "standing still" (relativistically speaking) while you are falling in a gravitational field; there is no force acting on you.

Propulsion is the work it takes to fight against the falling component of gravity, just like the pressure of the earth on your feet is doing the work of keeping you from falling toward the center of the earth.

The action-reaction component involves heating the air and the earth by pushing your propellant molecules earthward to maintain your altitude. Similarly, the earth heats up beneath your feet as the packed molecules of the earth fight against the natural tendency to collapse into the center.

Here is a question: If everybody in the Western Hemisphere jumped up and landed at the same time, would the earth shift twice? (Once for taking off and once for landing?) The answer is Yes, but while we were in the air, we would cause a shift in the other direction by attracting the earth toward us! The final effect would be zero, because the center of gravity (of us and the earth together) would not have changed.

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